Yes, Nisus Writer Pro (our word processor for Mac OS X) does support comments. You can add comments to any text in your document. Comments made by multiple authors on the same topic are grouped into a single conversation, reducing clutter.

Comments are ideal for collaboration with colleagues. Nisus Writer's commenting features are compatible with Microsoft Word. Comments can be easily exchanged between apps using a variety of file formats, including Microsoft Word document format (DOC / .doc) and RTF (rich text format).